Adjusting device.



O. EPPENSTEIN.

ADJUSTING DEVICE.

APPLICATION FILED NOV. 25. 1913.

1,142,756. Patented June 8, 1915.

UNITED STATES PATENT OFFICE.

OTTO EPIENSTEIN, OF JENA, GERMANY, ASSIGNOB TO THE FIRM 0F CARL ZEISS, 0F

JENA, GERMANY.

ADJUSTING DEVICE.

Specification of Letters Patent.

Patented J une 8, 1915..

lpplication filed November 25, 1913. Serial No. 802,944.

To all to]: 0m it may concern Be it known that I, O'rro EPPENSTEIN, a citizen of the German Empire, residing at Jena, Germany, have invented a new and useful Adjusting Device, of which the following is a specification.

The present invention relates to devices for presenting to a telemeter two marks with a distance apartequal to the base-line of the telemeter, the marks being each fitted to a carrier and the carriers being connected with oneanother. When a telemeter is directed toward such a pair of marks, which may lie at an unknown distance, this pair replaces, as is well known, a single mark lying at a known, viz. an infinite distance, so that on the strength of a measurement carried out for this mark the telemeter may be adjusted as regards its distance indications. It is in such a case, as is well known, a condition for the correctness of the adjustment, that the connecting line of the marks shall lie, on the adjustment being made, in a plane, which is perpendicular to the look-out direction of the telemeter, as otherwise not the distance apart of the two marks itself but only its projection onto the said plane 'forms the basis' of the adjustment. The well-known devices, in which the carriers of the marks are connected with each other by a rigid body, are, when being used, presented to the telemeter in such a manner (the telemeter lying horizontally) that the connecting line of the two marks lies horizontally, and are then observed by means of the telemeter. It is not always easy to maintain the above mentioned conditions for any length of time, unless a special supporting device for the adjusting device be made use of.

Thenew device is provided near one of the marks with a. suspending device; when it is suspended by it (e. 9. when held by the said suspending device by the hand), the connecting line of the two marks of itself adopts a vertical direction. The telemeter to be adjusted must be disposed with a vertical base-line and having each of its entrance openings approximately at the same elevation as the corresponding mark; on maintaining this condition, which is in general easy to fulfil, the line connecting the marks remains, without special provision being necessary, in a plane perpendicular to the look-out direction of the telemeter.

In order easily to bring about-the requisite agreement between the position as to height of the entrance openings and the marks, one of the mark-carriers or their connection may be fitted with a sighting device, which stands with its axis, when the adjusting device is being used, perpendicular to the vertical plane containing the marks.

iVhen it is desired to shorten the length of the adjusting device for transport purposes, theconnection between the two mark-carriers may be articulated. The device will occupy particularly little space, if there be employed as the connection between the mark-carriers means capable of resisting tension only, consisting of one member or a plurality of such members, 0. g. a pair of chains. WVhen a band-shaped member. e. y a strip of oil-cloth, is chosen as the connection, the end portions of this member may be utilized themselves as the mark-carriers.

In the annexed drawing: Figures 1 and 2 are a side and front elevation respectively of a constructional example of the adjusting device according to the invention. Figs. 3 and 4 are similar views of a second form of the adjusting device.

In Figs. 1 and 2 a lath a of rectangular cross-section provides by means of its end parts the carriers for the two stripe-shaped marks 71 and 5 At the upper end of the lath a handle a is fitted as the suspending device. To one ofthe narrow sides of thelath and at the same height as the mark I) a bar (1 is pivoted on a bolt d" so as to fold over, which bar is fitted at one of its ends with a notch e and at its other end with a front sight e A stop e serves the purpose of enabling that position to be found. in which the sighting device stands with its axis perpendicular to the plane containing the marks.

In the second example, Figs. 3 and 4, a plate f is fitted with a stripe-shaped mark I) and a second plate f with a stripe-shaped mark 6 Two chains 9 are each attached totwo screw-bolts h, which are fitted in holes passing through the plates f and f and connect the plates f and f with each other. The position of the bolts relatively to the plates is secured by nuts 2', by means of which also the distance between the marks may be adjusted. To the top end of each of the bolts passing through the plate f a chain 9 is attached. These two chains 9 are connected together by a ring 9". A bar d fitted with a notch e and a front sight 0 is pivoted on a bolt d", so as to fold over, and lies in that position, in which, on the adjusting device being suspended, the axis of the sighting device stands perpendicularly on the plane containing the marks, against the upper surface of the plate 7.

I claim:

1. Adjusting device comprising two marks, a carrier for each of the said marks, connecting means between the said carriers and suspending means for the adjusting device, fit-ted near one of the marks.

2. Adjusting device comprising two marks, a carrier for each of the said marks, non-rigid connecting-means between the said carriers andsuspending means for the adjusting device, fitted near one of the marks.

3. Adjusting device comprising two marks, a carrier for each of the said marks, means capable of resisting tension only, connecting the said carriers and suspending means for the adjusting device, fitted near one of the marks.

4. Adjustnig device comprising two marks, a carrier for each of the said marks, means capable of resisting tension only consisting of a plurality of members connecting the said carriers and suspending means for the adjusting device, fitted near one of the marks.

5. Adjusting device comprising two marks, a carrier for each of the said marks, connecting means between the said carriers, adapted to alter the distance apart of the said carriers and suspending means for the adjusting device, fitted near one of the marks.

6. Adjusting devic comprising two marks, a carrier for each of the said marks, connecting means between the said carriers, suspending means for the adjusting device, fitted near one of the marks and a sighting device fitted to the carrier of the latter mark.

. OTTO EPPENSTEIN. Witnesses:

PAUL Km'ienn, RICHARD HAHN. 

